US134296A

US134296A - Improvement in qrind

Info

Publication number: US134296A
Authority: US
Publication date: 1872-12-24
Anticipated expiration: 1889-12-24

Description

G.\M.LIBBEV.

Grinding Machines.

No. 134,296. Patented Dec124,1872.

@ aubjrr p W AM PHOTO-LITHOGRAPHIC CA7. Nf/CSEORNES PROCESS GEORGE W. LIBBEY, OF PHILADELPHIA, PENNSYLVANIA.

lhlPRQVEWEENT IN GRlNfiltG-EWACl-HNES.

Specification forming part of Letters Patent No. 1$1,2, dated December 21, 1872.

To all whom it may concern:

Be it known that I, GEORGE W. LIBBEY, of the city and county of Philadelphia and State of Pennsylvania, have invented an Improved Grinding-Machine, of which the following is a specification:

My invention relates to that class of grinding-machines in which a revolving grindstone or other grinding-disk is employed; and my invention consists in combining with the reciprocating rest of the machine a flexible guidebar, by the adjustment of which a straight or curved cutting-edge may be imparted to a plane-iron, chisel, or other cutting instrument. My invention also consists of a reciprocating rest, constructed in the peculiar manner fully described hereafter, for presenting the tool to the grinding-disk.

Figure 1 is a side view, partly in section, of my improved grinding-machine; Fig. 2, a vertical section of part of Fig. 1; Fig. 3, a plan view; and Fig. 4, a plan view of part of the machine.

A and A are the opposite side-frames of the machine, and to suitable bearings in these frames is adapted a shaft, B, which may be driven by hand, or through the medium of a treadle, by the foot, or by power, a cog-wheel, E, on the driving-shaft gearing into a pinion, F, on shaft 1), which also turns in the opposite frames, and which carries the grindingdisk Gr.

The frame A is constructed to serve as a shield for the wheel and pinion for the prevention of accidents, (see Fig. 1,) and for the sake of economy and uniformity the frame A is of similar construction.

The frames are connected together by a cross-bar, H, to which is secured, by three set-screws, d, d, and c, a flexible bar, I, the upper and lower edges of the latter being adapted to grooves in the armsf f of the sliding bracket J, to which is hinged, at the point an, a plate, K, the inclination of this plate being determined by a screw, L, passing through a swivel-nut, b, on the sliding bracket, and

connected to a coupling, a, jointed to the said plate K.

A reciprocating motion is imparted to the sliding bracket and its adjuncts by means of the crank M and connecting-rod N, the former being secured to a shaft, P, turning in suitable hearings in the frame A, this shaft deriving its rotating motion from the driving-shaft 13 through the medium of the bevel-pinion h and bevel-wheel i. The course in which the sliding bracket J reciprocates will depend upon the adjustment of the flexible guide-bar I. If this bar, by turning the screw 0, be permitted to bear throughout its whole length against the fixed cross-bar H, which is straight, then the bracket will reciprocate in astraight course; but if the flexible bar be adjusted to the curved shape shown in Fig. 4., then the bracket will reciprocate in a correspondingly curved course.

In sharpening the blade of a jack-plane, for instance, which has to be rounded on the edge, the flexible bar I is adjusted to a corresponding curve, and the blade is secured to the plate K by means of a set-screw, 3 passing through the usual hole in the blade, the plate being in the first instance elevated, and being gradually depressed by manipulatingthe screw L, while the cutting-edge of the reciprocating blade is caused to bear against the periphery of the grinding-disk Gr, this depression of the plate and blade being continued until the latter has been reduced to the desired extent, and has the proper bevel imparted to it.

WVhen the blade of a truing-plane or a paring-chisel has to be sharpened, the flexible bar is so adjusted as to be straight, in which case the result will be the imparting of a straight cutting-edge to the blade.

Many difierentcutting-tools may be sharpened and may have straight or curved cutting-edges imparted to them, as desired, by the machine, suitable appliances demanded by the nature of the tool being employed for securing it to the plate K. A concave edge may, if desired, be imparted to a blade or cutter, it the flexible bar be adjusted accordingly.

I claim as my invention- 1. A grinding-machine in which a reciprocating rest is combined with a flexible and adjustable guide-bar, substantially in the manner described.

2. The combination, with a grindstone, substantially as described, of the reciprocating bracket, the plate K hinged to the same, and the screw L, hinged swivel a, and self-accommodating not b.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEORGE W. LIBBEY.

Witnesses:

WM. A. STEEL, JOHN K. BUrER'rUs.